Los Angeles - Chris Martin included his children on Coldplay's new album to promote "togetherness" through challenging times.
The 37-year-old singer - who split from wife Gwyneth Paltrow last month after 10 years of marriage - says the personal theme of Ghost Stories was reflected by the inclusion of vocals from Apple, nine, and Moses, eight, and he found their presence in the recording studio "powerful".
Speaking about the contribution of his children - who appear on different tracks - with BBC Radio 1 DJ Zayn Lowe, he revealed: "My daughter is singing in there a little bit too. It was the idea of togetherness through life's challenges.
"For me, the message is don't ever let go. For example we've had friends who have killed themselves or gone down the wrong road because they haven't had the right people around them. And that's really sad.
"But having my son in the studio with me is really powerful."
The Magic singer - who has admitted his "own issues" contributed to the breakdown of his marriage - admits the album is full of messages of encouragement to himself.
He said: "I don't want to get too personal but that's just to me saying 'You're amazing, you've got to be amazing,' and I need to improve a bit.
"It's a new approach to life, because I had to change it."